I like the comment by David Wild in Rolling Stone's review: "This is the best record of its kind ever made, Then again," he added, "it's also the only record of its kind ever made."
The Travelling Wilbury's was not so much a "supergroup" as it was a group of muscians coming together for some fun, with an album resulting. Oh yeah, and those musicians just happened to all be legends.
Jeff Lynn - 20 Top 40 hits (with Electric Light Orchestra). Producer, songwriter.....
There is no doubting the creditials of these folks.
But more important, is that Travelling Wilburys comes of as as a group of friends having fun. There's nothing pretentious here. There's never any feel that this would be on ongoing enterprise (although they id do a second album). And while there's no iconic songs, the overall package really "clicks".